Electric fire-alarm



(No Model.)

M. M. BRAUN. ELECTRIC FIRE ALARM.

No 453,723. Patented June 9,1891.

\ y f 2 I V 8 1 1:2 I I 5 ii.

mix-"was s as H W sin/Cw 1*,

. used for separating the two contacts.

PATENT OFFICE.

MICHAEL M. BRAUN, OF AIJLEGYIENY, PENNSYLVANIA.

ELECTRIC FIRE-ALARM.

SPECIFICATION forming part of Letters Patent No. 453,723, dated June 9,1891.

Application filed February 17, 1891. Serial No. 381,765 (No model.)

To all whom it may concern:

Be it known that I, MICHAEL M. BRAUN. a citizen of the Inited States,residing at Allegheny, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inElectrically-Operated Fire-Alarms; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it pertains to make anduse the same, reference being had to the accompanying drawings, whichform a part of this specification.

My invention relates to an improvement in electric fire-alarms; and itconsists in a springcontact electrically connected to a battery, and aninflammable cord for holding the said spring "away from a stationarycontact secured in the frame, and a means for attaching the cordtogether in such a manner that a certain temperature will separate thesame, as will be more fully set forth hereinafter.

In the accompanying drawings, Figure 1 is a perspective View of myimproved fire-alarm, which is constructed in accordance with myinvention. Fig. 2 is a sectional side elevation of the same. Fig. 3aplan view of the cord To'construct a fire-alarm in accordance with myinvention, I providea bloc-k .l, of insulating material, of a suitablesize and form of construction, and attach thereto by means of a plate 2and wood-screws a spring-contact 3, which is electrically connected byawire 4 to a battery 5. Beneath the lower extremity of this spring 3 is astationary contact 6, secured in the block], which is connected by awire 7 to the other pole of the battery 5. Projecting at right anglesfrom the plate 2 is an arm 8, having a hook 9 at its forward end. Thishook'9 has a V-shaped groove on its upper end for connecting aninflammable cord 10, or other-means, to the point of the sp ing 3 below.This cord 10 consists of a thread, the two ends of which are connectedtogether by Wax or other suitable material, which when subjected to acertain degree of heat will separate.

In operation a number of these devices are placed at differentpositionsin a building and in such places or positions where fire-islikely to occur. An electric bell is-placed in thecircuit. Should a firetake place in the vicinity of one of these devices, the wax holding thetwo ends of the cord together melts, thereby releasing the spring 3 andforming a con tact with the piece 6, which completes a cir--- cuit tothe battery. The circuit being completed, an alarm is sounded, whichwill attract attc'ntion and provide time for the fire to be extinguishedbefore any damage is done. I Having thus described my invention, Iclaim- The herein-described fire-alarm, consisting of asolid base ofinsulating material, a spring contact-arm secured to said base andadapted to be connected at its upper end with one pole of a battery, astationary contact secured to the base beneath the free end of the armand adapted to be connected with the other pole of the battery, an armsecured to the first contact-plate and projecting at right anglesthereto, and a cord having its ends spliced and connected with wax,which joins the free end of the contact-arm and the rigid arm, andadapted to hold the spring-arm normally out of contact with the platebeneath it, as and for the purpose set forth.

MICHAEL M. BRAUN.

In presence of M. E. HARRISON, C. 0. LEE.

